Railway Coupling Bar Spherical Joint for Deflection
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Solution Overview
Problem
Existing railroad car coupling rod designs face challenges in achieving a continuous directional joint effect over deflection angles while being cost-effective and lightweight, as they either require numerous spring washers for large deflection angles, leading to space and cost inefficiencies, or result in impermissible restoring forces with fewer spring washers.
Innovation Solution
A directional joint oscillating plate with parallel spring washers and spherical rolling surfaces is introduced between the coupling rod end plates and support bearing plates, allowing for vertical and horizontal displacement of the longitudinal force transmission point, with spring deflection limiters ensuring a rigid force flow and compensating deflection angles through spherical surface adjustments, and incorporating an inner telescopic tube for length adjustability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large number of spring washers are arranged on the pressure side to achieve continuous directional joint effect over large deflection angles, then the directional joint effect is improved, but the device becomes space-consuming and costly in new construction and maintenance
Solution Approach 1:
The patent changes the geometric parameters of the coupling rod, specifically optimizing the distance between spring washers and the dimensions of the directional joint plate to achieve continuous directional joint effect with fewer spring washers. The directional joint plate with spherical rolling surface enables effective force transmission over large deflection angles without requiring excessive spring elements
Solution Approach 2:
The directional joint plate is equipped with a spherical rolling surface that contacts the support bearing plate. This spherical geometry enables continuous directional joint effect over large deflection angles by allowing smooth rotation and force transmission, eliminating the need for numerous spring washers to accommodate the deflection range
2Device complexity
If only one or two spring washers are used on the pressure side to reduce space and cost, then device complexity is reduced, but impermissible restoring forces occur briefly with large deflection angles
Solution Approach 1:
The directional joint plate acts as an intermediary element between the coupling rod and the support bearing plate. Its spherical rolling surface mediates the force transmission during deflection, ensuring continuous and controlled restoring forces even when using minimal spring washers. This intermediary prevents impermissible force spikes by distributing the restoring action smoothly over the deflection range
Solution Approach 2:
The patent optimizes the parameters of the remaining spring washers and the directional joint plate geometry to ensure adequate restoring force control with minimal spring elements. The distance between spring washers and the spherical rolling surface dimensions are carefully selected to maintain force stability throughout the deflection range
3Reliability
If telescopic tube connection and spherical rolling surfaces are added to achieve high-performance directional joint, then directional joint effect is improved, but production costs and weight increase
Solution Approach 1:
The patent combines the telescopic tube connection for length adjustment with the directional joint plate featuring spherical rolling surface into a single integrated structure. The directional joint plate serves dual purposes: enabling continuous directional joint effect over large deflection angles and providing the interface for telescopic tube connection. This merging eliminates the need for separate components, reducing overall weight and production costs while maintaining high-performance directional joint characteristics
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design achieves a horizontally stable and continuously increasing directional joint effect, reducing production and maintenance costs while maintaining a low net mass, and ensures effective force transmission across various deflection angles.
Implementation Method 1
a parallel pair of spring washers, which are elastically connected to one another in the vertical direction and in the horizontal direction
Implementation Method 2
the directional joint oscillating plate has spherical rolling surfaces in the case of coupling rod deflections
Data Source
Figure 1~3
Figure 4
AI summary
Between each end plate (4) of the coupling rod and the supportive bearing plate (5), there is a pivot plate (9). This (9) is supported by a pair of parallel spring discs on the coupling rod end . The pivot plate (9) has spherical rolling surfaces (11) facing the bearing plate (5). These permit rolling displacement of the point of longitudinal force (Ldk) transmission (14). This accommodates horizontal and vertical displacements during coupling rod deflection.